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UseModWiki: SiteList
http://www.usemod.com/cgi-bin/wiki.pl?SiteList
A large collection of Wikis, short descriptions, updated regularly,
Wiki4All Catalogue
http://wiki4all.com/
Categorised directory of wiki sites.
WorldWideWiki : SwitchWiki
http://www.worldwidewiki.net/wiki/SwitchWiki
SwitchWiki is an effort to list every public wiki.